Definition: to happen, often without being planned Level: B2
去年在同一十字路口发生过类似的事故。
A similar accident ___occurred at the same intersection last year.
如果机器没有得到适当维护，可能会发生严重损坏。
Serious damage can ___occur if the machine is not properly maintained.
现场直播期间有时会出现技术问题。
Technical problems sometimes ___occur during the live broadcast.
